SkyMapper Optical Follow-up of Gravitational Wave Triggers and OzGrav2.0

관리자 2021-04-29 5

  • Date 2021-04-29~2021-04-29, 16:00~17:00
  • Location 19-212
  • Speaker Dr. Seo-Won Chang(SNU ARC)

SkyMapper is the second largest-aperture optical wide-field telescope in Australia and can be used for transient detection in the Southern sky. Reference images from its Southern Survey cover the sky at δ <+10 deg to a depth of i ~ 20 mag. It has been used for surveys of extragalactic transients such as supernovae, optical counterparts to gravitational-wave (GW) and fast radio bursts. We adopt an ensemble-based machine learning technique and further filtering scheme that provides high completeness ~98% and purity ~91% across a wide magnitude range. Here we present an important use-case of our robotic transient search, which is the follow-up of GW event triggers from LIGO/Virgo. We discuss the facilitys performance in the case of the second binary neutron star merger GW190425. In time for the LIGO/Virgo O4 run, we will have deeper reference images for galaxies within out to ~200 Mpc distance, allowing rapid transient detection to i ~ 21 mag. Lastly, I'll introduce the OzGrav2.0 (next ARC Centre of Excellence for Gravitational Wave Discovery) that aims to make breakthroughs in fundamental physics and to explore objects at their most extreme.

 

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